添加 评分 vs 时长散点图q4-2.py

评分 vs 时长散点图q4-2.py

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+# q4/q4_2/q4_2.py
+import json
+import matplotlib.pyplot as plt
+
+# 读取数据
+with open("../q2_1_crawler/movies.json", "r", encoding="utf-8") as f:
+    data = json.load(f)
+movies = data["movies"]
+
+# 提取x时长、y评分
+duration = [m["duration"] for m in movies]
+rating = [m["rating"] for m in movies]
+
+# 散点图：红色，透明度0.6
+plt.scatter(duration, rating, color="red", alpha=0.6)
+plt.title("时长与评分关系散点图")
+plt.xlabel("时长（分钟）")
+plt.ylabel("评分")
+plt.tight_layout()
+
+plt.savefig("q4_2_scatter.png", dpi=150)
+plt.show()